Process of cracking petroleum oil



- June-24, 1930. G. EGLOFF PROCESS OF CRACKING PETROLEUM OIIl origina; Filed 001.718, 1925 WNW S17/1a??? fr: u 'tay-g Zoff,

Patented June 24561930 UNITED STATES PATENT OFI-ICE GUsTAv EGLorr, or CHICAGO, ILLINOIS, Assis-Non To UNIVERSAL OIL PRODUCTS COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or SOUTH DAKOTA PROCESSOF (TRACKING- PETROLEUM OIL Applicationlled ctober18, 1923, Serial No. 669,223. Renewed July 2, 1928il This invention relates toiinprovements-in are removed from the expansion chamber,l subJected to reflux action and reflux condensate returned tothe coil for further treatment.

One of the conditions to be noted in a process of thiskind is'to keep .the apparatuses free as possible from carbon depositslwhich tend to stop the process. At the same time in the treatment of certain oil it may be desirable to reci-'ack the residue, but this results in the clogging up ofthe coils, as the residue, of course, contains large percentagesA of the pitchy jell-like substances, which tend to clog up the tubes.

The object of the present inventionis to provide as a part of the-operation of a continuous process a step designed to precipitate out large parts of these pitchy'` like bodies and permit the rerunning the residue Ithrough heating coil.

The invention will be understood from the `following description, reference being had to the accompanying drawing, in which the 3o single gure represents a somewhat diagrammatic view, partly in side elevation and partly in vertical section of the apparatus'.Y

Referring to the drawings (1) designates the Jfurnace iny which is mounted the heating coil (2)7 The raw oil is -ed to the coil by means of feed pump (3) and feedline (4) and delivered from the coil by transfer line (5) having throttle valve (6) into one end of the horizontally extending chamber (7).

Vapors are removed from the expansion 1 chamber (7) by pipe (8) havingl throttle valve (9), which pipe` (8) leads to the lower end of dephlegmator (10), which dephlegmator has bafles (11) and vaporpipe (12),

having throttle valve (13) and leading to condenser coil (14). The-,lower end of condenser coil (14) is connected to the top of a conventional receiver (15), which receiver is provided with ress'ur'e control valve (16) and liquid drawo valve (17).

process in such as to cause an electrical current to pass through the oil, which .electrical current tends to precipitate out the solid or pitchy bodies contained in theresidue and reflux.

The mixture of residue and reflux condensate after being so electrically treated is drawn olt'through pipe (23.) by means of pump (24) and thencefed by'pipe (25) back to the `feed line (4).

-In carrying out the process the entire system, with the exception of the precipitating chamber, may be maintained under .a superatmospheric pressure of 100 pounds or more,

and the oil heated to a cracking temperature of 800ov F. The oil in the precipitating chamber (20) may be under atmospheric pressure, which can be accomplished by suitably regulating the valvesshown.

This arrangement permitsiof the rerunning of the residue freed vfrom its pitchy or solid like bodies, which bwill tend to clog up the heating tubes.

It desired, only part of the' refiux condensate need be sent to the precipitating Ichamber. This may be accomplished by employing the bypass line (18') and by-suitably controlling the valves (26) and (27) shown on the drawings. l

I claim .as my invention:

l. A process of cracking oil, consisting in passing oil through a heating coil and thence through an expansion chamber, where it is maintained at cracking conditions of tem-,

perature and pressure, taking off vapors from the expansion chamber and subjecting them to a redux condensingl action and withuum from said expansion chamber and sub jecting said residuum and reflux condensate to the action of an electrical current to separate therefrom the solid pitch-like constituents therein, and in returnin the pitch-free residual oil and refluxcon ensate to said co1 2. A process for cracking hydrocarbon oil comprising subjecting the oil to cracking conditions f` temperature and pressure in a still, taking o vapors, subjecting the same toLrelux condensation, drawing off residue from the still and commingling the same with reux condensate resulting from the subjection of the vapors to thereux condensing action and` subjecting the comlmingled residue to the action of an electric current to separate therefrom solid and pitch-like constituents andl reintroducing the residual oil and reux condensate free from such constituents into the still.

i GUSTAV EGLOFF. 

